. >>> niners/seahawks game at candlestick park on sunday is a big one and security will be just as big. linda yee explains how police will handle the rowdy police. >> reporter: rivalry intense. sunday's game between the niners and the seahawks promises to be one for the books. >> this is the defending champion against the current top seed in the nfc west. these two teams, they don't like each other. >> just in case sunday's showdown gets rowdy, more cops will be at candlestick in uniform and undercover. >> we always have police officers dressed in rivalry team, jerseys, hats, whatever. they'll be out in numbers this time. >> reporter: ever since wall at the niners/raiders game two years ago, police have been more vigilant. >> they have a few people telling us to watch our backs, but we're not too scared. >> reporter: what's with the hard hat? >> it protects me in case it gets crazy out at the game. >> reporter: all in good fun. and still the cops, they're making sure the fans don't act tougher than the football team. and if fights break out, it's game over for the fans involved. and be